With the Real-Time Monitoring functionality of Performance Explorer, you can monitor a broad range of systems by creating and configuring charts that show the system performance in real-time. It is possible to open multiple charts at the same time, which allows you to watch the performance of two or more systems simultaneously, for example the web server performance and the operating system performance. Adding measures to a chart is easy and intuitive in Performance Explorer: You can drag a single measure or a set of measures from the tree onto the chart.